Putting this under Feature Requests instead of Troubleshooting, because nothing here is truly buggy, but it's awfully awkward to use. I've found the song selection and options menus to be extremely sluggish to navigate, particularly in Fullscreen mode. Some specific nitpicks:
1) For some reason, Fullscreen slows my mouse down quite a bit when navigating the game menus, but NOT when playing the actual game. (Meaning I can surf just fine, but I overcompensate for a sluggish cursor and end up clicking on the wrong song or display option, etc.) This doesn't seem to happen in "windowed" mode, but then, when I need to register what blocks are what color and respond accordingly in a split second, I want those blocks to be as big as possible! (In other words, I don't want to play the game at any resolution other than Fullscreen.)
2) Due to the sluggishness of the mouse, I often resort to keyboard when trying to navigate through my music files and pick a song. For example, I'll hit "K" to jump to the folders in the list that start with K (since I have each artist in a separate folder), click on that folder, and then if there are multiple albums in that folder, I'll hit the first letter of the album title (since all of my mp3 files are named "Album Title - 01 - Song Title.mp3"). But for a letter with a lot of entries such as "S" or "M", I'll still have to scroll a bit to see them all on screen. It would be nice for keyboard navigation to work cumulatively, like it does in Windows' file menus - i.e. typing "MU" in rapid succession would make it much easier to get to "Muse", rather than "M" taking me to the first item under "M" and then "U" immediately jumping me to the U's.
3) Related to #2, I've also noticed that using the keyboard to navigate further up in a list (i.e. hitting "A" or even "Home" to try to return to the beginning of a file list) sometimes doesn't work at all. Again, this forces me to use the sluggish cursor to scroll back up. All letters should work. "Home" should return to the first file in the list. "End" should jump to the last. A functional "Page Up" and "Page Down" would be nice bonuses.
4) I'd honestly just use the external file browser to pick songs all the time (since the keyboard navigation works as expected there), except that doing this takes me out of Fullscreen mode. Windows is particularly slow about switching between the two modes, and it's annoying to change resolution back and forth every time I pick a new song. I realize it probably isn't possible to switch to another window that exists outside of Audiosurf while keeping Audiosurf fullscreened. But maybe this can be resolved by a "Maximize" command for Audiosurf that goes to the highest resolution that fits without truly going to Fullscreen? Then the other window popping up wouldn't reset the resolution.
Can any of these things be fixed? Pretty please?